PREFACE 



THERE are several excellent books devoted to the anat- 

 omy of the nervous system, there are others which treat 

 of its physiology in an illuminating way, and others still 

 which deal with its hygiene. If the present volume is 

 not to be an impertinence, it must be justified by its 

 attempt to combine some elements of the three. The 

 intention has been to present no more anatomy than is 

 essential to an appreciation of the correlated physiology 

 and to subordinate the physiology, in its turn, to the 

 teaching of hygiene. 



In the chapters which deal with structure and func- 

 tion the writer has tried to gather his material from 

 authoritative sources. In those occupied more largely 

 with hygiene, personal judgments have doubtless found 

 expression. But the desire has been not so much to 

 dictate in a dogmatic spirit as to open important mat- 

 ters to fuller discussion. 



Many associates have contributed to the making of 

 this book. From the number it is just to mention Pro- 

 fessor Ernest G. Martin, of Harvard, whose suggestions 

 have been numerous and valuable. 



P. G. S. 

 November, 1914 



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